266:. Using this technology the user can capture an ultra high definition echogram of cornea, think of it as a corneal A-scan. Pachymetry using the corneal waveform allows the user to more accurately measure the corneal thickness, have the ability to check the reliability of the measurements that were obtained, have the ability to superimpose corneal waveform to monitor the change of patients cornea over time, and ability to measure structures within the cornea such as micro bubbles created in the cornea during femto-second laser flap cut.
146:
229:. Using this technology the user can capture an ultra-high definition echogram of the cornea, somewhat like a corneal A-scan. Pachymetry using the corneal waveform process allows the user to more accurately measure the corneal thickness, verify the reliability of the measurements that were obtained, superimpose corneal waveforms to monitor changes in a patient's cornea over time, and measure structures within the cornea such as micro bubbles created during femto-second laser flap cuts.
40:
253:. As a result of this study and others that followed, corneal pachymetry is now widely used by both glaucoma researchers and glaucoma specialists to better diagnose and detect early cases. Newer generation pachymeters have the ability to adjust the intraocular pressure that is measured according to the corneal thickness.
241:
by placing a pair of incisions of a particular depth and arc length at a steep axis of corneal astigmatism. By using the corneal pachymetry the surgeon will reduce the chances of perforation of the eye and improves surgical outcome. Newer generations of pachymeters will help surgeons by providing
261:
Modern devices use ultrasound technology, while earlier models were based on optical principles. The ultrasonic
Pachymeters traditionally have been devices that provide the thickness of the human cornea in the form of a number in micrometres that is displayed to the user. The newer generation of
208:
and optical such as confocal microscopy (CONFOSCAN), or noncontact methods such as optical biometry with a single
Scheimpflug camera (such as SIRIUS or PENTACAM), or a Dual Scheimpflug camera (such as GALILEI), or Optical Coherence Tomography (OCT, such as Visante) and online Optical Coherence
249:. In 2002, the five-year report of the Ocular Hypertension Study (OHTS) was released. The study reported that corneal thickness as measured by corneal pachymetry was an accurate predictor of glaucoma development when combined with standard measurements of
225:. Conventional pachymeters are devices that display the thickness of the cornea, usually in micrometres, when the ultrasonic transducer touches the cornea. Newer generations of ultrasonic pachymeters work by way of
282:
57:
123:
104:
311:
213:
procedure for ensuring sufficient corneal thickness to prevent abnormal bulging of the cornea, a side effect known as ectasia.
76:
237:
Corneal pachymetry is essential for other corneal surgeries such as Limbal
Relaxing Incisions. LRI is used to reduce corneal
61:
83:
90:
312:"Limbal Relaxing Incisions Made Simple | OphthalmologyWeb: The Ultimate Online Resource for Ophthalmologists"
189:
72:
338:
50:
263:
226:
296:
Eisner, R; Israel, R (November 1, 2006). "Corneal waveform measurements has advantages in pachymetry".
145:
250:
210:
181:
97:
204:
It can be done using either ultrasonic or optical methods . The contact methods, such as
169:
17:
332:
245:
Corneal pachymetry is also considered an important test in the early detection of
238:
185:
39:
209:
Pachymetry (OCP, such as ORBSCAN). Corneal
Pachymetry is essential prior to a
205:
173:
246:
193:
28:
177:
161:
192:
and is useful in screening for patients suspected of developing
33:
27:"Pachymeter" redirects here. Not to be confused with
180:. It is used to perform corneal pachymetry prior to
242:graphical surgical plans to eliminate astigmatism.
221:The instrument used for this purpose is known as a
138:
64:. Unsourced material may be challenged and removed.
160:is the process of measuring the thickness of the
8:
291:
289:
144:
124:Learn how and when to remove this message
275:
262:ultrasonic pachymeters work by way of
135:
172:used to measure the thickness of the
7:
62:adding citations to reliable sources
314:. Ophthalmologyweb.com. 2008-08-27
25:
38:
150:A typical ultrasound pachymeter
49:needs additional citations for
1:
300:. Vol. 24, no. 21.
355:
26:
143:
264:Corneal Waveform (CWF)
227:Corneal Waveform (CWF)
18:Corneal Waveform (CWF)
251:intraocular pressure
73:"Corneal pachymetry"
58:improve this article
298:Ocular Surgery News
211:refractive surgery
196:among other uses.
182:refractive surgery
158:Corneal pachymetry
139:Corneal pachymetry
155:
154:
134:
133:
126:
108:
16:(Redirected from
346:
323:
322:
320:
319:
308:
302:
301:
293:
284:
280:
148:
136:
129:
122:
118:
115:
109:
107:
66:
42:
34:
21:
354:
353:
349:
348:
347:
345:
344:
343:
329:
328:
327:
326:
317:
315:
310:
309:
305:
295:
294:
287:
281:
277:
272:
259:
235:
219:
202:
151:
130:
119:
113:
110:
67:
65:
55:
43:
32:
23:
22:
15:
12:
11:
5:
352:
350:
342:
341:
339:Eye procedures
331:
330:
325:
324:
303:
285:
274:
273:
271:
268:
258:
255:
234:
231:
218:
215:
201:
198:
170:medical device
153:
152:
149:
141:
140:
132:
131:
46:
44:
37:
24:
14:
13:
10:
9:
6:
4:
3:
2:
351:
340:
337:
336:
334:
313:
307:
304:
299:
292:
290:
286:
283:
279:
276:
269:
267:
265:
256:
254:
252:
248:
243:
240:
232:
230:
228:
224:
216:
214:
212:
207:
199:
197:
195:
191:
187:
183:
179:
175:
171:
167:
163:
159:
147:
142:
137:
128:
125:
117:
114:February 2015
106:
103:
99:
96:
92:
89:
85:
82:
78:
75: –
74:
70:
69:Find sources:
63:
59:
53:
52:
47:This article
45:
41:
36:
35:
30:
19:
316:. Retrieved
306:
297:
278:
260:
244:
236:
222:
220:
203:
165:
157:
156:
120:
111:
101:
94:
87:
80:
68:
56:Please help
51:verification
48:
239:astigmatism
233:Indications
217:Pachymeters
190:LRI surgery
188:screening,
186:Keratoconus
318:2015-02-22
270:References
257:Technology
223:pachymeter
206:ultrasound
166:pachymeter
84:newspapers
333:Category
247:glaucoma
194:glaucoma
29:Calliper
200:Process
98:scholar
184:, for
178:cornea
162:cornea
100:
93:
86:
79:
71:
168:is a
105:JSTOR
91:books
164:. A
77:news
176:'s
174:eye
60:by
335::
288:^
321:.
127:)
121:(
116:)
112:(
102:·
95:·
88:·
81:·
54:.
31:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
